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No. 6l0,493. Patented Sept. 6, I895. n. B. McMUBBAY.

PAPER MAKING MACHINE.

(Application filed. Feb. 26, 1898.)

(No Model.)

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UNITED STATES FETCH DENNIS B. MGMURRAY, OF FITOI-IBURG, MASSACHUSETTS,ASSIGNOR OF ONE-HALF TO GEORGE R. WALLACE, OF SAME PLACE.

PAPER-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 610,493, datedSeptember 6, 1898.

Application filed February 26, 1898. Serial No. 671,818. (No model.)

To all whmn it may concern.-

Be itknown that I, Dennis E. MCMURRAY, of Fitchburg, county ofWorcester, State of Massachusetts, have invented an Improvement inPaper-Making Machines, of which the following description, in connectionwith the accompanying drawings, is a specification, like letters on thedrawings representing like parts.

This invention has for its object to improve that class of paper-makingmachines known as Fourdrinier, myimprovements relating especially to thepressure bar or device, co1 n monly called the guard-board, cooperatingwith the felt-covered couch-roll located above the endless belt or wireon which the paper is laid and formed for the production of the web. Thesurface of every part of the covering of this roll has to be washedbetween the time that it leaves and again contacts with the web, so thatthe covering of said roll shall not put back on the web any foreignspecks or material taken up byit. The couch-roll is washed by aconstantly-running stream of Water put on the top of the roll at a pointbehind a perpendicular line drawn through the axis or center of rotationof said roll, and consequently to prevent any specks or motes taken fromthe roll by the stream of water getting back onto the web of paper orthe water used to wash the roll and getting onto the paper a pressurebar or device, com monly called the guard-board, is located back of theupper center line of said roll, said pressure bar or device fittingclosely the cloth or other covered surface of the couch-roll. Thepressure-bar bears heavily on the surface of the couch-roll, and byreason of the pressure exerted by it the covering of the roll or of thebar is rapidly worn away.-

In accordance with my invention the pressure bar or device is composedof a bar having at its edge next said couch-roll an inflated ordistended india-rubber tube suitably covered and opposed to and so as tobear against the surface of the covering of the couch-roll, saidinflated tube presenting a surface which may yield to the imperfectionsof the coverin g-jacket of the couch-roll, yet removing any adheringlump, speck, or foreign substanceor de'vicet Fig. 2 is anlendelevationof the parts shown in Fig. 1, and Figs. 3 and 4 are detailsshowing the opposite ends of the tube 1), with its plugs.

A represents, let it be supposed, part of the framing of aFourdriniermachine for making paper; B, the ordinary cloth or other surfacedcouch-roll; O, the roll with which said couchroll cooperates, said rollC in practice preferably supporting the usual belt or wire employed inthe machine.

The roll B is carried bya shaft B, and the roll 0 is carried by a shaft0'.

The frame A has erected upon it at each side suitable stands A, to whichis jointed at A a movable frame D, said frame having suitable bearingsfor the shaft B, while the frame Alias suitable bearings for the shaft0.

The frame D has an upright portion D, having suitable slots or holes, inwhich may be located suitable bolts a, said bolts being passed through apressure bar or device a, commonly called the guard-board. The loweredge of this pressure bar or device has applied to it a fiexiblepipe b,a little longer,

preferably, than the couch-roll, and the opposite ends of said pipe maybe plugged or filled in with metallic plugs 12 W, said plugs being shownin the detailed views, Figs. 3 and 4:, they being firmly secured in saidpipe, the inner ends of the plugs preferably falling just at or'butsidethe ends of the roll B. One of the plugs or one end of the tube, asb mayhave fitted to it a valve-stem 6 which may be connected with any usualor suitable airpump, such as commonly used for inflating bicycle orother tires, or said valve-stem may be connected with any pump to forcea gas or liquid or fluid into said pipe in order to inflate it, thedegree of pressure determining the hardness or yielding quality of thetube. This tube is inclosed within a covering, as c, of felt, cloth, orother usual material, said covering contacting directly with thecovering of the couch-roll; but the felt cloth by being backed up by theinflated tube will, it is obvious, be free to yield as required.

I make and maintain a substantially watertight connection between thecovering constituting the acting face of the pressure bar or device andthe surface of the covering of the couch-roll.

In practice I find the pressure bar or device having an inflated tube atits acting edge, which maintains an even pressure throughout the lengthof the couch-roll B, results in reduction of power required to operatethe couch-roll, increases the life of the belt or wire, prevents thevibration of the bar or guard-board, and results in very much less wearon the cover of the-couch-roll, and, besides, it is more efficient inoperation than a pressure-bar having its edge bare or surrounded only bya felt or other fibrous cover.

While a round plane-surfaced tube operates to excellent advantage, yetthis invention is not limited to the particular shape of said tube incross-section or to the fact of the tube being more or less smoothexternally.

It is preferable to seat that side of the tube 1) nearest theguard-board in a concaved seat. This concaved seat I prefer to form ofsheet metal, as at f, the concave running parallel with the edge of theguard-board, the shank f of the concave running, preferably, against thetop of the guard-board underneath the felt covering 0, said shank beingattached to the guard-board by suitable screws.

The covering a is held on the guard-board by any usual or suitabletacks, as e In Fig. 1 I have broken away part of the covering to showthe shank of the concave under it.

The guard-board may be backed up at its upper edge by suitablehand-screws II.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is

1. In a paper-making machine, a couch-roll, combined With apressure-bar, guard-board or device, having at its acting edge aninflated tube, substantially as described.

2. In a paper-making machine, a couch-roll, combined with apressure-bar, guard-board, or device having at its acting edge aninflated tube, said tube being inclosed by a covering, substantially asdescribed.

3. In a paper-makin g machine, a couch-roll, combined with apressure-bar, guard-board or device, having at its acting edge aninflated tube, said tube having a connected valvestem, substantially asdescribed.

4. In a paper-making machine, a couch-roll, combined with apressure-bar, guard-board or device, having at its acting edge aninflated tube, said tube being provided at its ends with rigid blocks,substantially as described.

5. In a paper-making machine, a couch-roll, combined with a press 11re-bar, guard-board, or device having at its acting edge an inflatedtube, said tube being provided at its opposite ends with blocks, one ofsaid blocks having a valve-stem, substantially as described.

6. In a paper-making machine, a couch-roll, and means to sustain itsshaft; combined with a pressure-bar, guard-board or device having at itsacting edge parallel to said roll, a tube; and a fibrous coveringinclosing said tube, said covering being connected with and carried bysaid pressure bar or device, substantially as described.

7. In a paper-making machine, a pressurebar, guard-board, or device,provided at one edge with a concave; combined with an inflated tubeseated in said concave, and a covering for said tube, substantially asdescribed.

In testimony whereof 'I have signed my name to this specification in thepresence of two subscribing witnesses.

DENNIS l3. MOMURRAY.

Witnesses:

GEORGE R. WVALLACE, WYLON G. HAYES.

